Flu Symptoms in Kids: Signs, Care and When to Get Help

Flu symptoms in kids commonly include cough, fever or chills, sore throat, a runny or blocked nose, body aches, headache, and unusual tiredness. Vomiting or diarrhea can also occur. Symptoms often begin suddenly, but some children have flu without a fever. Breathing difficulty, dehydration, or reduced alertness needs immediate medical care.

Young children cannot always explain a headache or aching muscles. What you observe matters: how they breathe, whether they drink, how often they urinate, and whether they respond normally. This guide focuses on children and babies. For the broader symptom overview, read our main flu symptoms guide.

When a child needs help immediately

Seek immediate medical care if your child has trouble breathing, bluish lips, a seizure, or difficulty staying alert. Any fever in a baby younger than 12 weeks also needs medical care right away. For severe breathing distress or difficulty waking, call your local emergency number. Do not wait for a positive flu test.

See the full warning-sign list. Source: CDC emergency warning signs.

In this guide

Common symptoms
Babies and toddlers
Early signs and fever
Duration and recovery
Warning signs
Home care and treatment
School, daycare, and prevention
Common parent questions

What are the main flu symptoms in kids?

Children with influenza may have a combination of respiratory symptoms and whole-body discomfort. A cough with aches, chills, or exhaustion can suggest flu, but it does not confirm the cause.

Symptom	What a parent may notice
Fever or chills	An elevated temperature, shivering, or feeling feverish. Some children have no fever.
Cough	A new cough, which can be dry.
Sore throat or congestion	Throat discomfort, nasal drainage, or a blocked nose.
Headache or body aches	Complaints of pain or soreness in a child who can describe it.
Tiredness	Less energy or activity than usual.
Vomiting or diarrhea	Digestive symptoms occurring alongside the illness.

These observations help describe the illness. Other infections can look similar, so a checklist should not replace clinical assessment. Source: CDC childhood flu symptoms.

What should you watch for in babies and toddlers?

Watch breathing, feeding, wet diapers, and alertness rather than relying on a young child to describe symptoms. Changes in these areas help you explain what is happening when you seek advice.

Note what is different from your child's normal behavior. A short description such as “drinking much less than usual” or “breathing looks harder” is more useful than guessing whether an infant has a headache. You do not need to work out the diagnosis yourself before contacting a clinician.

Children younger than five have an increased risk of flu complications, especially those younger than two. Infants younger than six months are too young for a flu vaccine, which makes protection from vaccinated caregivers particularly important. Source: CDC, Flu and Children.

What are the early flu symptoms in children?

Flu often begins abruptly, with several symptoms developing around the same time. Fever is not always the first sign. Chills, aches, tiredness, cough, or other respiratory symptoms may be part of the initial illness.

Try to identify when the change started. If your child was playing normally after breakfast but developed chills and a cough that evening, record that timing. It may help a clinician decide how to assess the illness and whether early treatment is relevant.

Can a child have flu without a fever?

Yes. A child can have influenza without fever. A normal temperature does not explain away new breathing problems or reduced alertness. Source: CDC treatment guidance for children.

Can flu cause vomiting or diarrhea in kids?

Yes. Young children may have nausea, vomiting, or diarrhea along with respiratory symptoms. Tell the clinician about both digestive and respiratory changes rather than assuming they are separate illnesses. Source: CDC clinical guidance.

How long do flu symptoms last in kids?

Uncomplicated influenza symptoms generally resolve within three to seven days, although cough and a lingering feeling of being unwell can persist beyond two weeks. This is a general influenza range, not a guaranteed recovery schedule for a child.

Look at the direction of change. Gradual improvement differs from a fever or cough that settles and then returns or becomes worse. New problems should be assessed on their own merits, even if your child is still within the first week of illness. Source: CDC clinical signs and duration.

Seek advice if symptoms do not improve after about a week, or sooner if you are concerned. Do not wait for a particular day when a warning sign is present. Source: NHS advice on seeking care.

Is it flu, a cold, or another infection?

Symptoms alone cannot reliably confirm influenza. A clinician may diagnose flu using the symptoms and clinical circumstances, or recommend testing when confirmation would help.

A rapid antigen test can miss some infections. A negative result does not always exclude flu, especially when the symptoms still concern the clinician. Some tests check for influenza and COVID-19 together because these illnesses can overlap. Source: CDC flu diagnosis guidance.

Keep the test instructions and record when the sample was taken. Share the result together with your child's symptoms, rather than treating the result as the complete assessment.

Which children have a higher risk of serious flu?

Children younger than five, especially those younger than two, and children with certain chronic health conditions have a higher risk of complications. Conditions such as asthma and diabetes can affect care decisions.

Contact your child's healthcare professional early if your child belongs to a higher-risk group and develops suspected flu. Older children without underlying conditions can also become seriously ill. Complications can include pneumonia, dehydration, ear infections, or worsening of an existing condition. Source: CDC childhood flu risks.

Emergency flu warning signs in children

Obtain medical care immediately for any of these warning signs:

Rapid or difficult breathing, or ribs pulling inward with breaths.
Bluish lips or face.
Chest pain.
Muscle pain severe enough that the child refuses to walk.
Dehydration, including no urine for eight hours, a dry mouth, or no tears.
Reduced alertness or interaction when awake.
Seizures.
Fever above 104°F (40°C) that fever-reducing medicine does not control.
Any fever in a baby younger than 12 weeks.
Fever or cough that improves and then returns or worsens.
Worsening of a chronic condition.

These signs are not an exhaustive list. Seek care for any severe or concerning change. Source: CDC emergency warning signs.

How can you care for a child with mild flu?

Rest, fluids, and appropriate symptom relief can help a child with mild illness. Home care does not replace assessment when the child is at higher risk or becoming more unwell.

Parent offering a glass of water to a child seated at a kitchen table.

Allow rest and offer fluids. If you are considering medicine for fever or discomfort, check that the product is suitable for the child's age and circumstances. Follow the label and seek a pharmacist's or clinician's advice if unsure. Avoid combining products with the same active ingredient. Source: NHS flu self-care guidance.

Do not give aspirin or salicylate-containing products to children or teenagers with suspected or confirmed flu. CDC links their use in this situation to Reye's syndrome, a rare but serious complication. Ask the prescriber for advice if your child normally takes a salicylate-containing medicine. Source: CDC care guidance.

Should a child receive an antiviral?

A clinician should decide. Prescription flu antivirals work best when started within two days, but later treatment can still benefit appropriate children. Prompt treatment is particularly important for severe, progressive, or hospitalized illness and for higher-risk children. Do not rule out treatment because more than 48 hours have passed. Source: CDC antiviral guidance for children.

What should you record before calling?

When the first symptoms began.
Temperature readings and how you measured them.
Drinking, feeding, urination, and wet-diaper changes.
Breathing changes and whether the child responds normally.
Medicines already given, including the amount and time.
Medical conditions, allergies, and test results.

If there is an emergency warning sign, seek care first. Gathering a perfect record should never delay help.

When can a child return to school or daycare?

CDC community guidance allows return to usual activities when, for at least 24 hours, symptoms are improving overall and there has been no fever without fever-reducing medicine. Follow school, daycare, and local public health rules as well.

Use added precautions for the next five days, such as cleaner air, hygiene, and other measures suitable for the child's age and setting. If fever returns or the illness worsens, keep the child home again. A child without fever still needs assessment of overall improvement. Source: CDC respiratory illness guidance.

CDC flu-specific guidance also advises staying home from work for at least five days after onset when someone has suspected or confirmed flu without fever. That work recommendation is not a universal school rule; check the policy that applies to your child. Source: CDC flu care guidance.

How can families reduce flu risk?

CDC recommends annual flu vaccination for children aged six months or older and their caregivers, with rare exceptions. Ask your child's clinician about suitability and the appropriate schedule. Hand hygiene, covering coughs, and reducing contact while sick also help protect others. Source: CDC, Flu and Children.

Frequently asked questions about flu symptoms in kids

Does every child with flu have a high fever?

No. Some children with influenza have no fever. Consider the overall illness and seek care for concerning changes. CDC childhood flu guidance.

Can flu symptoms include ear pain?

Yes. Children with flu can have ear pain, and ear infections can occur as a complication. Tell a healthcare professional about new or worsening pain. NHS flu guidance.

Does a negative test mean it is safe to ignore worsening symptoms?

No. Some tests can miss influenza, and other illnesses may need care. Seek assessment based on the child's condition, not just the test result. CDC testing guidance.

Can an older, otherwise healthy child get serious flu?

Yes. Higher-risk groups need particular attention, but children outside those groups can also become very ill. CDC childhood risk guidance.

Should you wait for a positive test before calling about treatment?

No. Contact a clinician early for a higher-risk child or concerning illness. They can decide whether testing or treatment is needed. Emergency signs require immediate care. CDC care guidance.

Sources and further reading

This guide provides general health education and does not replace an individual medical assessment.